Kelly Osbourne has signed up as a DJ on Radio 1 while Chris Moyles' show has been lengthened, the British radio station announced today.
The revamp, of which the Sunday night changes are aimed at under-18s, will also see an unknown - Greg James - take over the early breakfast slot.
He will be replacing early breakfast show presenters JK and Joel in the 4am to 6.30am slot.
JK and Joel, who have been at the station for three-and-a-half years, will also be losing the chart show to Fearne Cotton and Reggie Yates.
Sharon and Ozzy Osbourne's daughter, 22, will host the BBC's flagship station's 'Surgery' slot, part of the new "teen zone" on Sunday evenings.
Her show will tackle "all the questions young people face from relationships through to health and education" as well as play music.
The Chris Moyles Show, which has 7.26 million listeners, will start at 6.30am instead of 7am from October 15.